MP4575

5A, 4.5V - 55V Input,

Frequency-Programmable, Fully Integrated,

Synchronous, Step-Down Converter

MP4575 Rev. 1.0

www.MonolithicPower.com

1

8/16/2016

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DESCRIPTION

The MP4575 is a frequency-programmable,

step-down, switching converter with integrated,

internal,

high-side

and

low-side

power

MOSFETs. The MP4575 can provide 5A of

continuous output current with peak current

control for excellent transient response and

efficiency performance.

The wide 4.5V to 55V input voltage range

accommodates

a

variety

of

step-down

applications,

including

industrial,

PoE,

automotive, and printers with a DC high-voltage

bus.

The MP4575 uses peak-current-mode control to

regulate

the

output

voltage.

The

MP4575

provides over-current protection (OCP) with

valley current detection, which is used to

prevent the current from running away. The

MP4575 also has accurate and reliable over-

voltage protection (OVP) and auto-recovery

thermal protection.

An optional external soft start is available.

Enable and power good indication functions can

be used to track the power easily. To increase

efficiency,

the

MP4575

scales

down

the

switching frequency automatically when the

load is light. Meanwhile, the low-side MOSFET

is turned off to reduce driver loss when zero

inductor current is detected.

Synchronous

operation

mode

with

the

integrated low-side MOSFET is useful for

reducing conduction loss and reducing external

components space to save cost.

The MP4575 is available in a TSSOP-20 EP

package with an exposed pad.

FEATURES

 Wide 4.5V to 55V Input Voltage Range

 90mΩ and 70mΩ Internal High-Side and

Low-Side Power MOSFETs

 Peak-Current-Mode Control

 Programmable Switching Frequency

 Optional External Soft Start

 Over-Current Protection (OCP) with Valley

Current Detection

 Supports External Synchronous Clock

 Over-Voltage Protection (OVP)

 Current Limit Decreases during Output

Short for Better Thermal Performance

 Power Good Indication

 Thermal Shutdown Protection

 Available in a TSSOP-20 EP Package

APPLICATIONS

 PoE Input Non-Isolated Buck

 Industrial Power Systems

 Printers and Scanners

 Automotive Power Systems

 Distributed Power Systems

All MPS parts are lead-free, halogen-free, and adhere to the RoHS

directive. For MPS green status, please visit the MPS website under

Quality Assurance.

“MPS” and “The Future of Analog IC Technology” are

registered trademarks of Monolithic Power Systems, Inc.